scanner二次输入

好记性不如烂笔头

import java.util.Scanner;public class ChengJiDengJi {    /**     * @param args     */    static double mark ;    public static void main(String[] args) {        // TODO Auto-generated method stub        while(true){            try {                Scanner sca = new Scanner(System.in);                mark = sca.nextDouble();                if(mark>=0&&mark<=100){                    break;                }                System.out.println("————————");//              break;            } catch (Exception e) {                System.out.println(".....");                System.out.println(e.toString());            }        }        if(mark<60){            System.out.println("N");        }else{            System.out.println("Y");        }//      System.out.println(mark);    }}